harmony 鸿蒙PatternLock

2022-08-09
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PatternLock

The <PatternLock> component allows users to use a pattern password for authentication. It enters the input state once a finger is pressed against it, and exits the input state and completes the input once the finger leaves the screen.

NOTE

This component is supported since API version 9. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

PatternLock(controller?: PatternLockController)

Parameters

Name	Type	Mandatory	Description
controller	PatternLockController	No	Controller of a component to reset the component status.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Description
sideLength	Length	Width and height (same value) of the component. If this attribute is set to 0 or a negative number, the component is not displayed. Default value: 288vp
circleRadius	Length	Radius of the grid dot. If this attribute is set to 0 or a negative value, the default value is used. Default value: 6vp
regularColor	ResourceColor	Fill color of the grid dot in the unselected state. Default value: ‘#ff182431’
selectedColor	ResourceColor	Fill color of the grid dot in the selected state. Default value: ‘#ff182431’
activeColor	ResourceColor	Fill color of the grid dot in the activated state, which is when the dot is highlighted but not selected. Default value: ‘#ff182431’
pathColor	ResourceColor	Path color. Default value: ‘#33182431’
pathStrokeWidth	number \|string	Width of the path stroke. If this attribute is set to 0 or a negative value, the path stroke is not displayed. Default value: 12vp
autoReset	boolean	Whether to allow the user to reset the component status (that is, clear the input) by touching the component again after the input is complete. The value true means that the user can reset the component status by touching the component again after the input is complete, and false means the opposite. Default value: true

Events

In addition to the universal events, the following events are supported.

Name	Description
onPatternComplete(callback: (input: Array<number>) => void)	Invoked when the pattern password input is complete. input: an array of digits that are the indexes of the connected grid dots and are arranged in the same sequence as the dots are connected. The indexes of the grid dots are as follows: 0, 1, 2 for the dots in the first row from left to right; 3, 4, 5 for the dots in the second row; 6, 7, 8 for the dots in the third row.
onDotConnect(callback: Callback<number>)¹¹⁺	Invoked when a grid dot is connected during pattern password input. NOTE The callback parameter is a digit that is the index of the connected grid dot. The indexes of the grid dots are as follows: 0, 1, 2 for the dots in the first row from left to right; 3, 4, 5 for the dots in the second row; 6, 7, 8 for the dots in the third row.

PatternLockController

Implements the controller bound to the <PatternLock> component for resetting the component status.

Objects to Import

let patternLockController: PatternLockController = new PatternLockController()

reset

reset(): void

Resets the component status.

setChallengeResult¹¹⁺

setChallengeResult(result: PatternLockChallengeResult): void

Sets the authentication challenge result for the pattern password.

Name	Type	Mandatory	Description
result	PatternLockChallengeResult	Yes	Authentication challenge result of the pattern password.

PatternLockChallengeResult¹¹⁺

Name	Description
CORRECT	The pattern password is correct.
WRONG	The pattern password is incorrect.

Example

// xxx.ets
@Entry
@Component
struct PatternLockExample {
  @State passwords: Number[] = []
  @State message: string = 'please input password!'
  private patternLockController: PatternLockController = new PatternLockController()

  build() {
    Column() {
      Text(this.message).textAlign(TextAlign.Center).margin(20).fontSize(20)
      PatternLock(this.patternLockController)
        .sideLength(200)
        .circleRadius(9)
        .pathStrokeWidth(18)
        .activeColor('#B0C4DE')
        .selectedColor('#228B22')
        .pathColor('#90EE90')
        .backgroundColor('#F5F5F5')
        .autoReset(true)
        .onDotConnect((index: number) => {
          console.log("onDotConnect index: " + index)
        })
        .onPatternComplete((input: Array<number>) => {
          // If the length of the entered password is less than 5, the system prompts the user to enter the password again.
          if (input === null||input === undefined||input.length < 5) {
            this.message = 'The password length needs to be greater than 5, please enter again.'
            return
          }
          // Check whether the password length is greater than 0.
          if (this.passwords.length > 0) {
            // Check whether the two passwords are the same. If yes, the system displays a message indicating that the password is set successfully. If no, the system prompts the user to enter the password again.
            if (this.passwords.toString() === input.toString()) {
              this.passwords = input
              this.message = 'Set password successfully: ' + this.passwords.toString()
              this.patternLockController.setChallengeResult(PatternLockChallengeResult.CORRECT)
            } else {
              this.message = 'Inconsistent passwords, please enter again.'
              this.patternLockController.setChallengeResult(PatternLockChallengeResult.WRONG)
            }
          } else {
            // The system prompts the user to enter the password again.
            this.passwords = input
            this.message = "Please enter again."
          }
        })
      Button('Reset PatternLock').margin(30).onClick(() => {
        // Reset the pattern lock.
        this.patternLockController.reset()
        this.passwords = []
        this.message = 'Please input password'
      })
    }.width('100%').height('100%')
  }
}

patternlock